Ignition timer



April 7, 1925. 1,532,591

E. KROKAVETZ IGNITION TIMER Filed April 19, 1923 2 Sheets-Sheet 1 April 7, 1925.

E. KROKAVETZ IGNITION TIMER Filed April 19, 1923 2 Sheets-Sheet 2 v 5 wet.

Patented Apr. 7, 1925..

UNITED EUGENE KROKAVETZ, OF CLEVELAND, OHIO.

IGNI'IIGFJ' TIMER.

Application filed April 19, 1923. Serial No. 633,208.

To all 4.07: am it may concern:

Be it known that I, EUGENE KnoKA- vn'rz, a citizen of the United States, residing at Cleveland, in the county of Guyahoga and State of Ohio, have invented certain new and useful Improvements in Ignition Timers, of which the following is a specification.

This invention relates to timers particularly adapted and intended for use in periodically closing the circuits to spark plugs in internal combustion engines, and in the form shown is especially adapted for use on Ford cars, the object being to produce an improved timer and distributor as will more fully appear from the following description and claim.

In the accompanying drawings, Fig. 1 1s a rear elevation of the timer, detached. Fig.

2 is a central longitudinal section showing the device attached to an engine. Fig. 3 is a detail in section on the line 3-3 of Fig, 1. Fig. 4 is a front elevation. Fig. 5 is a section on the line 55 of Fig. 2. Fig. 6 is a detail in elevation of the distributor block. Fig. 7 is a wiring diagram.

Referring specifically to the drawings, 1 indicates a circular casing or housing preferably made of insulating material which is enlarged diametrically at the rear end as indicated at 2, and this enlarged end has a groove 3 in the edge thereof which receives a flange 4 projecting from the front of the crank case 5. The housing 1 is held in place by a spring arm 6 pressing against the front thereof. The casing 1 can be turned on the circular flange 4 to change the time of ignition by an arm 7 which is fastened to the casing and connected to a rod 8 operated by any suitable means.

The rear end 2 of the casing is slotted as shown at 9, and a breaker arm 10 works in this slot, being pivoted to a post 17 fastened to the casin by a bracket 12. The arm 10 has a breaFrer point 13 on the outer end thereof which is normally in contact with the other breaker point 14 by a flat curved spring 15 one end of which is fastened t0 the arm 10 by screws 16 and the other end is fastened to a binding post 17 extending through the wall of the casing and connected by wire 40 to ground. The point 14 is adjustably mounted in a bracket 18 secured to the casing by screws 19 and having a binding post 20. A tapered block 21 is secured to the arm 10 by the screws 16 and this block is wiped by the high points 22 of the cam 23 secured to the front end of the engine cam shaft 24.

The camblock 23 has a front tubular extension 25 with two grooves 26 cut therein, these grooves being spaced 45 from each other. A rotary block 27, having an extension 28, fits on the extension 25 of the cam block and is held in fixed relation thereto by a lug 29 which engages in one of the grooves 26, so that the block is rotated with the cam.

Four binding posts 30 are mounted in the front wall 31 of the casing 1, and have enlarged heads 32 which are flush with the inner face 33 of the wall 31, and are adapted to be successively wiped by the outer' end 34 of a spring plate 35 mounted on the front face of the block 27 and its extension 28. A center plug 36 is also mounted in the wall 31, flush with'the face 33 and is enga ed p at all times by the spring 35, and this p ug 36 is connected to a binding post 37. The block 27 and spring '35 are held against the contact points and face 33 by a coiled spring 38 mounted within the extension 25 on the cam block, one end of the sprin bearing against the end of the cam sha t 24 and the other end against the inside of the block 27.

When the device is used with a coil, the block is set with lug 29 in one notch 26, and when it is used With a vibrator, it is placed in the other notch. In Fig. 7 the device is shown used with a coil, the binding post 20 being connected by a wire 41 to one end of the primary winding 42 of the coil 43, the other end of the winding being connected to the battery 43 by a wire 44, the other side of the battery being connected to ground. The terminals 32 are connected to spark plugs 44 bv the wire 45 and the plugs are indicated as grounded by a wire 46. The plug 36 is connected by the binding post 37 and wire 47 to one of the secondary 48 of the coil, the other end' being grounded by the wire 49.

The operation is as follows: When the cam 23 is rotated by the shaft 24, it vibrates the arm 10 and makes and breaks the primary circuit at the points 13 and 14, the

coil inducing high tension in the secondary circuit to the spark plugs which is closed at proper times by the rotary block 27 and its connecting parts, the wiper 34 closing successively with the heads 32.

When a coil is used, the block 27 is so placed that the spring 35 is in contact with the heads 32 when the primary circuit is broken, that is, when the points 13 and 14 are open. When a vibrator is used instead of the coil, the block 27 must be so placed that the wiper spring 35 will be in engagement with the heads 32 when the points 13 and 14: are closed. This is effected by shifting the block 27 to locate the lug '29 in the other notch 26.

This combined timer and distributor may be substituted for the ordinary commutator found on Ford cars and will be found very serviceable for the intended purpose. The absence of gears or hearings in the timer is to be noticed, and the compact ar rangement is an advantage.

I claim:

The combination with a timer casing having contacts in the end wall and an opening in the side Wall thereof, of a shaft projecting into the casing, a distributor block mounted on the shaft and cooperating with said contacts, a spring between the end of the shaft and the block, pressing the latter axially against said contacts, the shaft being provided with a hollow caln member on the end thereof which fits within the distributor block, and the spring being confined within said hollow member, and a breaker arrn mounted within the casing; and projecting thru said opening, said breaker arm being operated bv the cam and cooperating with a breaker point on the outside of the casing.

In testimony whereof I afiix my signature in presence of two witnesses.

EUGENE KROKAVETZ. Witnesses:

JOHN A. Borrrrrmnn'r, Bnssrn F. POLLAK. 

